The other side of that same coin (called "controlling our numbers"), just in a couple of decades, would be turning your country into one of the current western countries with alleged better living standards, which countries now import workers from all over with different lifestyle, habits, customs, religion, etc., whose pension funds are drying out as there are no children (new working force) that would fill them up, and by all of that slightly but securely losing their identity and facing the slow death of their nations.
That's the other side of that same birth-control coin.

Maybe you think it's impossible for it to happen to you and your country, but even if you think that you are one of the poorest third-world countries, believe it or not, there are even poorer people out there.
Think about it!

Imagine yourself 30 years from now, during which some sort of more or less excessive birth-control was in action (this way or another). Only 20 years from now, your country will start facing the exact same problems the Western countries are facing now. And that's not all.
Your country will be flooded with some jungle tribesmen, some of whom may have even arrived from some cannibal tribes, but at some point, they were the only ones who wanted to do specific, low-paying jobs, and over a sudden, you and the rest of the origins of your country find yourself overwhelmed and outnumbered by people with entirely different manners, habits, customs, moral, etiquette, etc. - imposed on all your current habits and tradition.
How are you going to feel?!